Centrifugal governor



Nov. 9,1926. 1,606,138

C. C. BARBER CENTRIFUGAL GOVERNOR Filed June 27, 1921 Fiy Patented Nov.9, 1926.

UNITED STATES 1,606,138 PATENT OFFICE.

CHARLES C. BARBER, OF 'FREEPORT, NEV YORK, ASSIGNOR TO WESTERN ELECTRICCOMPANY, OF NEW YORK, N. Y.,

A CORPORATION OF NEW YORK.

CENTRIFUGAL GOVERNOR.

Application filed June 27, 1921. Serial No. 480,681.

This invention relates to centrifugal controlling devices and isdirected more particularly to a centrifugal switch operating mechanism.

I The specific embodiment of the invention described hereinafter is analarm circuit operating mechanism, the function of which is to indicateabnormally high and low speeds of a rotating shaft. The mechanismcomprises a oentrifugally responsive device or governor, and a set ofcontact springs operable by said governor to close one or the other oftwo alarm circuits whenever the speed of the shaft goes above or belownormal.

The object in view is the provision of simple and effective means forregulating the action of a centrifugal governor over a wide range ofspeeds, and in accordance with this object the charateriz'ing feature ofthe invention consists in mounting the retractile springs of thegovernor on pliable arms which may be bent so as to shift the positionof the springs with respect to the pivotal points of the lever arms,thereby varying the moment of resistance to centrifugal force. Not onlydoes this provide a very simple, effective and economical construction,but it insures permanency of regulation as there are no parts which canget out of adjustment of their own accord.

Reference will now be had to the drawing for a more complete descriptionof the invention.

Figure 1 is an elevational view of the alarm mechanism with the casingshown in cross-section Figure 2 is a cross-sectional View along the line"2--2 of Figure 1;

7 And Figure 3 is a cross-sectional view along the line 33 of Figure 2.

To the rotatable spindle 1 there is securely fixed a collar 2. The leverarms 3 are pivotally secured to the collar 2 by .means of pins 4. Leverarms 5 are each pivotally secured to one of the lever arms 3 by means ofpin 6, and are also pivotally secured to the bushing 7 by pins 8. Thebushing 7 is mounted on the end of spindle 1 and is free to movelongitudinally thereon.

To each lever arm 3 there is riveted a pair of angle brackets 9, and thesprings 10 are attached to the laterally extending arms of thesebrackets. The, springs 10 operate to circuit for indicating abnormallyhigh speed restrain the toggles comprising lever arms 3 and 5 againstcentrifugal force, and when the spindlel is stationary, the toggles areheld retracted by said springs, as shown in full lines in Figure 1. Whenthe spindle is rotated, the toggles move outwardly against the tensionof springs 10 in response to centrifugal force, as indicated by thedotted outline in Figure 1.

Bushing 7 is moved longitudinally on the spindle in response to thelateral movement of the toggle as will be evident, and accordingly anyincrease in the speed of spindle 1 W111 cause the movement of bushing 7to the right, as viewed in Figure 1. Likewise, an decrease in the speedof the spindle wil tlafffict the movement of bushing 7 toward the Theoperating contact spring 11 is disposed between contact springs 12 and13. Spring 11 is provided with an insulating stub 14 which is pressedagainst bushing 7, and spring 11 accordingly follows the longitudinalmovement of said bushing.- When the spindle is stationary, or operatingbelow normal speed, contact springs 11 and 12 are engaged as shown inFigure 1, and a suitable alarm circuit for indicating abnormally lowspeed is closed by the latter? spring.

With the spindle at normal speed, spring 11 is held out of engagementwith the contacts of both springs 12 and 13, and when the speed exceedsnormal, the contact of spring 11 is brought into engagement with thecontact of spring 13. A second alarm is closed through springs 11 and13.

Angle brackets 9 are made preferably of pliable metal, such as brass,and the laterally extending arms thereof to which retractile springs 10are attached, are adapted to be bent to permit shifting the positions ofsprings 10 with respect to the positions-of pivot pins 4. It will beseen that if the angle brackets are bent until the retractile springsare as near as possible to the center of pins 4, the moment ofresistance/to centrifugal force will be reduced to a minimum, and if thebrackets are bent so as to move the springs away from the center ofpins'4, the opposite result will obtain,

The spindle 1 is intended to run at a constant speed. and the governoris adjusted to maintain the contacts between springs 11, 12

' ried and 13 open so long as the speed does not vary more than a smallamount either way from normal. 1 a I The governor may be adjusted tomaintain the contacts open at an speed over a very wide range by bendingthe angle brackets as previously describe What is claimed is: p 1. In acentrifugal overnor, a pair of rotatably mounted togg es, a pair ofsprings, two airs of separately adjustable In S carliy said toggles andnormally pro ecting at right angles to the plane of said toggles, eachof said springs connecting the free ends of a pair of said lugs, saidlugs being ed on a rotata adjustable toward and away from the pivotalpoints of the to gle.

2. n a centrifugal governor, the combination of a tog) 1e e s aft, apair of springs, a pair of pliable lugs secured on o posite faces ofeach toggle, one lug of eac li pair cooperating with the correspondinlug of the other pair to anchor at their ree ends one of sand springs,the position of said springs being adjustable by said lugs in adirection parallel to the anus of the shaft.

In witness whereof, I hereunto subscribe my name this 23rd day of JuneA. 1)., 1921.

CHARLES C. BARBER.

oint lever system mount-

